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以层流等离子弧作为热源对共析钢进行表面淬火,通过等离子表面淬火热传导的理论分析,对等离子弧扫描速度对硬化层最大硬化深度的影响进行研究。并利用电子扫描显微镜、显微硬度计等试验手段,研究了淬火硬化层的显微组织和力学性能。结果表明:层流等离子弧扫描速度越快,淬火硬化层最大硬化深度越小。得出等离子弧扫描速度与淬火硬化层最大硬化深度之间的关系,并且与实验结果相吻合。淬火硬化层组织为板条状马氏体和针状马氏体,淬火硬化层与基体的界面组织为珠光体和隐针马氏体,基体组织为珠光体。淬火硬化层硬度由共析钢基体的350 HV提高到900～1000 HV。
The effect of plasma arc scanning speed on the maximum hardening depth of hardened layer was studied by surface quenching of eutectoid steels with laminar plasma arc as heat source. The microstructure and mechanical properties of the hardened layer were studied by means of scanning electron microscopy and microhardness tester. The results show that the faster the laminar plasma arc scanning speed is, the harder the hardened layer is. The relationship between the scanning speed of plasma arc and the maximum hardening depth of quench hardened layer is obtained, which is consistent with the experimental results. Quenching hardened layer lath martensitic and acicular martensite, quench hardened layer and the matrix interface structure of pearlite and hidden needle martensite, the matrix organization of pearlite. The hardness of the hardened layer is increased from 350 HV of the eutectoid steel matrix to 900 to 1000 HV.